Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Income Statement [Abstract]
Revenue	$ 46,327	$ 39,844	$ 90,745	$ 75,782
Cost of revenue	13,349	12,977	25,382	22,555
Gross profit	32,978	26,867	65,363	53,227
Marketing	10,511	7,356	20,449	16,138
Technology and development	12,138	8,801	23,220	16,651
Customer service and operations	4,798	4,371	9,407	8,345
General and administrative	7,544	4,817	15,130	9,975
Total operating expense	34,991	25,345	68,206	51,109
Income from operations	(2,013)	1,522	(2,843)	2,118
Other income (expense):
Interest expense	(325)	(344)	(694)	(672)
Interest income	72	69	148	145
Other income (expense)	(18)	170	(130)	190
Income (loss) before income taxes	(2,284)	1,417	(3,519)	1,781
Provision for income taxes	52	19	80	31
Net income (loss)	$ (2,336)	$ 1,398	$ (3,599)	$ 1,750
Net income (loss) per share:
Basic	$ (0.06)	$ 0.04	$ (0.09)	$ 0.05
Diluted	$ (0.06)	$ 0.03	$ (0.09)	$ 0.04
Weighted-average shares used to compute net income (loss) per share:
Basic	39,183	38,102	38,994	37,952
Diluted	39,183	41,622	38,994	41,667